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Single Family ResidenceResidential
$623,486$319 / ft²
TopHap EstimateOur estimate of what this home would sell for today, based on nearby sales, the home's size and features, and local price trends. It is a starting point, not an appraisal.· confidence 93How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Jul 14, 2026
Last sold for $400,000 on Dec 6, 2019

401 ROCK AVE

GREEN BROOK, NJ 08812
0
Baths
1,954 ft²
Living AreaTotal finished area of the structures, from county records. Some counties include shared space like hallways or a building gym, so it may not match a listing.
0.52 ac
Lot SizeThe size of the land the home sits on, from county records.
1961
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$623K
$581K low$666K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$400,000 · Dec 6, 2019

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$10,867 (2025)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$544,900 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$296,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$248,900
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$511,400
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$544,900

Climate Risk

Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.44
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
17
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
68
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
91
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
43
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.minimal

Scores 0–100; higher = greater projected risk.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountySOMERSET
Lot (acres)The size of the land the home sits on, from county records.0.52
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(2)

Sales and refinances filed with the county for this home. Not every transfer is a normal sale, so check the type before comparing prices.

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

M
Green Brook Middle SchoolB
Middle · Grades 5–8 · 0.7 mi
E
Irene E. Feldkirchner Elementary SchoolB
Elementary · Grades PK–4 · 1.2 mi
H
Watchung Hills Regional High SchoolA
High · Grades 9–12 · 2.8 mi

District: Green Brook Township School District

Neighborhood · ZIP 08812These are comparison scores, not percentages. 100 equals the national average, so 150 means about 50% above average.

CrimeLocal crime compared with the rest of the country, where 100 is average. It reflects things like population density, income, and how crime gets reported.121
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.96
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.102

Index scale: 100 = US average (tick). Lower is better.

Homes occupiedThe share of homes here that someone lives in. The rest sit empty, including vacation and for-sale homes.97%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.29%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.13%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.7%
PopulationHow many people live in this area.15,513
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,931 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$123,698
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$147,053
Average tempThe average temperature here across a full year.52°F
Annual precipHow much rain and melted snow falls here in a typical year.49 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.56%

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Data by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.

How this home compares

401 Rock Ave measured against every home in its neighborhood, its ZIP code and its county, using county assessor records refreshed nightly. A home can stand out in one of those areas and look ordinary in another, because each one holds a different mix of homes.

  • Costs less per square foot than 70% of homes in Somerset County
  • Has a bigger lot than 83% of homes in Dunellen 08812
  • Older than 70% of homes in Somerset County

What homes are worth in Dunellen 08812

Each bar is how many homes fall in that price range. The marker is this home.

This home
$361K$1.5M

This home is worth more than 62% of homes in Dunellen 08812.

How it measures up in Dunellen 08812

The dot is this home. The mark in the middle is the typical home in Dunellen 08812.

Estimated value$623,486
CheaperTypical $564,808Pricier

Pricier than 62% of homes nearby

Price per ft²$319
CheaperTypical $343Pricier

Pricier than 31% of homes nearby

Living area1,954 ft²
SmallerTypical 1,743 ft²Bigger

Bigger than 62% of homes nearby

Lot size0.52 ac
SmallerTypical 0.24 acBigger

Bigger than 83% of homes nearby

Year built1961
OlderTypical 1956Newer

Newer than 59% of homes nearby

How 401 Rock Ave ranks against every home in each area.
MeasureThis homeDunellen 08812Somerset County
Estimated valuepricier than$623,48662% of homes44% of homes
Price per ft²pricier than$31931% of homes30% of homes
Living areabigger than1,954 ft²62% of homes52% of homes
Lot sizebigger than0.52 ac83% of homes66% of homes
Year builtnewer than196159% of homes30% of homes

About 401 Rock Ave

How much is 401 Rock Ave, Green Brook, NJ worth?

The TopHap Estimate for 401 Rock Ave, Green Brook, NJ is $623,486 as of Jul 14, 2026. The likely range is $580,786 to $666,186. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 401 Rock Ave, Green Brook, NJ last sell?

401 Rock Ave, Green Brook, NJ last sold on Dec 6, 2019 for $400,000, according to the county's recorded deed.

How big is 401 Rock Ave, Green Brook, NJ?

401 Rock Ave, Green Brook, NJ has 1,954 square feet of living space and a 0.52-acre lot.

When was 401 Rock Ave, Green Brook, NJ built?

401 Rock Ave, Green Brook, NJ was built in 1961, making it 65 years old. The building has 1 story.

What schools serve 401 Rock Ave, Green Brook, NJ?

401 Rock Ave, Green Brook, NJ is assigned to Green Brook Middle School (middle), rated B; Irene E. Feldkirchner Elementary School (elementary), rated B; Watchung Hills Regional High School (high), rated A. All sit in Green Brook Township School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 401 Rock Ave, Green Brook, NJ compare to other homes in Dunellen 08812?

Among the 4,191 homes in Dunellen 08812, it is worth more than 62% of them ($623,486 against a typical $564,808), its price per square foot is higher than 31% of them ($319 against a typical $343), it is bigger than 62% of them (1,954 ft² against a typical 1,743 ft²), its lot is bigger than 83% of them (0.52 ac against a typical 0.24 ac) and it is newer than 59% of them (1961 against a typical 1956). Measured against all of Somerset County, it is worth more than 44% of homes there. These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 401 Rock Ave, Green Brook, NJ?

The 2025 property tax bill for 401 Rock Ave, Green Brook, NJ was $10,867. The county assessed it at $544,900.

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